From pc at p-cos.net  Tue Feb  2 19:18:11 2010
From: pc at p-cos.net (Pascal Costanza)
Date: Tue, 2 Feb 2010 20:18:11 +0100
Subject: [closer-devel] Small changes
Message-ID: <8BC6E0FD-4CB2-4188-AC3E-6FDF11E3C958@p-cos.net>

Hi,

Some small changes are in the repository since of today:

+ I have removed dynamic-extent declarations throughout all the libraries. It turns out that my mental model of dynamic extent declarations was wrong and I used it too liberal. This is fixed now. It shouldn't have created too many problems, but I indeed got bugs occasionally, so I think it's safer this way.

+ In some performance experiments I made it turned out that special classes with special slots slow down initialization of objects a lot. The main reason is that I have to define a replacement of the standard shared-initialize functionality, and that is simply too slow. It seems to me that special slots are used rarely, so I just added a configuration option to not inherit from special-class in layered-class, such that define-layered-class doesn't automatically incorporate the special slots functionality. See contextl.asd for details how to switch that optimization on. I'd be interested to hear whether this indeed buys you anything.

+ I also added a slight performance improvement for (general) slot accesses in LispWorks in Closer to MOP.


Cheers,
Pascal

-- 
Pascal Costanza, mailto:pc at p-cos.net, http://p-cos.net
Vrije Universiteit Brussel
Software Languages Lab
Pleinlaan 2, B-1050 Brussel, Belgium